Patty is taking out a simple interest loan to buy her new 10689 car how much would she pay in interest of the rate is 4.5 and she pays the loan off in 4 years?

To calculate the interest on Patty's loan using simple interest, the formula is ( I = P \times r \times t ), where ( I ) is the interest, ( P ) is the principal amount (the loan), ( r ) is the interest rate (as a decimal), and ( t ) is the time in years. Here, ( P = 10,689 ), ( r = 0.045 ), and ( t = 4 ). Plugging in the values, the interest would be ( I = 10,689 \times 0.045 \times 4 = 1,917.06 ). Therefore, Patty would pay approximately $1,917.06 in interest over four years.